Pulse signal de-noising based on wavelet transform and coherent averaging method

Ruirui Zhao; Liquan Dong; Yuejin Zhao; Ming Liu; Lei Yang; Ding Zhang; Jingsheng Zhao; Jinhui Xing

doi:10.1117/12.2034463

23 December 2013 Pulse signal de-noising based on wavelet transform and coherent averaging method

Ruirui Zhao, Liquan Dong, Yuejin Zhao, Ming Liu, Lei Yang, Ding Zhang, Jingsheng Zhao, Jinhui Xing

Proceedings Volume 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing; 90430J (2013) https://doi.org/10.1117/12.2034463
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

A new method of pulse signal de-noising based on wavelet transform and coherent averaging method is proposed. Pulse signal is complex and weak, generally submerged by the interference of baseline drift, motion artifact and high frequency noise. Consequently, it’s difficult to measure the heart rate by processing only one single-channel pulse signal, especially when the noise frequency and the pulse signal frequency are in the same frequency range. In this paper, multichannel pulse signal processing based on wavelet transform and coherent averaging is proposed to solve the above problem. First, the detail coefficients and approximation coefficients of each channel signal are obtained by N layer wavelet decomposition, then reconstructing the signal with high layers coefficients as the high frequency noises always exist in low layers coefficients. In this way we can filter out the high frequency interference. Second, the centerline of the upper and lower envelope curve obtained by cubic spline estimation is subtracted from each reconstructed signal so as to eliminate the baseline drift completely. Finally, the heart rate is acquired with the coherent averaging method which results in the noise being offset each other and the pulse signal being enhanced in the frequency range of pulse wave. The pulse signal and three kinds of noise signals simulated with the superposition of different frequency sin signal were analyzed, besides the experiment of six channel pulse signals measured simultaneously based on PhotoPlethysmoGraphy (PPG) were conducted. The simulation and experiment results showed that this method was superior to the traditional single channel.

Citation Download Citation

Ruirui Zhao, Liquan Dong, Yuejin Zhao, Ming Liu, Lei Yang, Ding Zhang, Jingsheng Zhao, and Jinhui Xing "Pulse signal de-noising based on wavelet transform and coherent averaging method", Proc. SPIE 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 90430J (23 December 2013); https://doi.org/10.1117/12.2034463

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KEYWORDS

Interference (communication)

Wavelet transforms

Signal to noise ratio

Wavelets

Heart

Filtering (signal processing)

Electronic filtering

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